1,325 research outputs found
Una Colección de metáforas para explicar (y entender) el EEES
La implantación del sistema europeo de créditos
dentro del marco del Espacio Europeo de
Educación Superior tiene implicaciones profundas
en nuestra labor como profesores al pasar de una
docencia centrada en la enseñanza (en el profesor)
a otra centrada en el aprendizaje (en el estudiante).
Con frecuencia, estas implicaciones no son bien
explicadas o comprendidas. En este artÃculo se
propone un conjunto amplio de metáforas que
pueden resultar útiles para explicar y comprender
mejor dichas implicaciones, con una nota de
humor y con una mirada fresca y diferente al
problema, que nos ayude a tomar un poco de
distancia con nuestras circunstancias particulares
y prejuicios.Peer Reviewe
Computing size-independent matrix problems on systolic array processors
A methodology to transform dense to band matrices is presented in this paper. This transformation, is accomplished by triangular blocks partitioning, and allows the implementation of solutions to problems with any given size, by means of contraflow systolic arrays, originally proposed by H.T. Kung. Matrix-vector and matrix-matrix multiplications are the operations considered here.The proposed transformations allow the optimal utilization of processing elements (PEs) of the systolic array when dense matrix are operated. Every computation is made inside the array by using adequate feedback. The feedback delay time depends only on the systolic array size.Peer ReviewedPostprint (published version
Conflict-free strides for vectors in matched memories
Address transformation schemes, such as skewing and linear transformations, have been proposed to achieve conflict-free access to one family of strides in vector processors with matched memories. The paper extends these schemes to achieve this conflict-free access for several families. The basic idea is to perform an out-of-order access to vectors of fixed length, equal to that of the vector registers of the processor. The hardware required is similar to that for the access in order.Peer ReviewedPostprint (author's final draft
FAQ sobre la adaptación de asignaturas al EEES: docencia centrada en el aprendizaje del estudiante
Muchas son las preguntas y las dudas que se plantean los profesores a la hora de adaptar una asignatura al Espacio Europeo de Educación Superior. Pasar de un modelo de docencia centrado en la enseñanza (en el profesor) a un modelo centrado en el aprendizaje (en el estudiante) plantea diferentes tipos de preguntas, que suelen repetirse en todos los foros de discusión. Algunas de estas preguntas tienen que ver con los nuevos métodos docentes (en qué se basan, qué ventajas aportan, cómo se implementan…). Otras tienen que ver con la dificultad de implantar los nuevos enfoques en el contexto actual de nuestra universidad, con los estudiantes que nos llegan y con los profesores que tenemos. En este documento respondemos a 23 de estas preguntas tÃpicas, agrupadas en los dos apartados comentados, con la esperanza de que las respuestas ayuden a los profesores a adaptar sus asignaturas al nuevo entorno.Postprint (published version
Diez metáforas para entender (y explicar) el nuevo modelo docente para el EEES
La adopción de los nuevos modelos docentes, centrados en el aprendizaje del alumno, tal y como se nos requiere en el marco del Espacio Europeo de Educación Superior, tiene implicaciones profundas en nuestra labor como profesores. Con frecuencia, estas implicaciones no son bien explicadas o comprendidas. En este artÃculo se proponen 10 metáforas que pueden resultar útiles para explicar y comprender mejor dichas implicaciones, con una nota de humor y con una mirada fresca y diferente al problema, que nos ayude a tomar un poco de distancia con nuestras circunstancias particulares y prejuicios.Postprint (published version
Niveles de competencia de los objetivos formativos en las ingenierÃas
En este artÃculo se discute la cuestión del nivel de
competencia de los objetivos formativos en
nuestras materias, y las implicaciones en los
métodos docentes y de evaluación. A partir de esta
discusión se ofrecen algunas reflexiones crÃticas
sobre la situación actual de la docencia en nuestro
contexto.Postprint (published version
Systematic Review of Plasmid AmpC Type Resistances in Escherichia coli and Klebsiella pneumoniae and Preliminary Proposal of a Simplified Screening Method for ampC
Beta-lactamase (BL) production is a major public health problem. Although not the most
frequent AmpC type, AmpC-BL is increasingly isolated, especially plasmid AmpC-BL (pAmpCBL).
The objective of this study was to review information published to date on pAmpC-BL in
Escherichia coli and Klebsiella pneumoniae, and on the epidemiology and detection methods used by
clinical microbiology laboratories, by performing a systematic review using the MEDLINE PubMed
database. The predictive capacity of a screening method to detect AmpC-BL using disks with
cloxacillin (CLX) was also evaluated by studying 102 Enterobacteriaceae clinical isolates grown in
CHROMID ESBL medium with the addition of cefepime (FEP), cefoxitin (FOX), ertapenem (ETP),
CLX, and oxacillin with CLX. The review, which included 149 publications, suggests that certain
risk factors (prolonged hospitalization and previous use of cephalosporins) are associated with
infections by pAmpC-BL-producing microorganisms. The worldwide prevalence has increased over
the past 10 years, with a positivity rate ranging between 0.1 and 40%, although AmpC was only
detected when sought in a targeted manner. CMY-2 type has been the most prevalent pAmpC-BLproducing
microorganism. The most frequently used phenotypic method has been the double-disk
synergy test (using CLX disks or phenyl-boronic acid and cefotaxime [CTX] and ceftazidime) and
the disk method combined with these inhibitors. In regard to screening methods, a 1- g oxacillin
disk with CLX showed 88.9% sensitivity, 100% specificity, 100% positive predictive value (PPV),
98.9% negative predictive value (NPV), and 98.9% validity index (VI). This predictive capacity
is reduced with the addition of extended-spectrum beta-lactamases, showing 62.5% sensitivity,
100% specificity, 100% PPV, 93.5% NPV, and 94.1% VI. In conclusion, there has been a worldwide
increase in the number of isolates with pAmpC-BL, especially in Asia, with CMY-2 being the most
frequently detected pAmpC-BL-producing type of microorganism. Reduction in its spread requires
routine screening with a combination of phenotypic methods (with AmpC inhibitors) and genotypic
methods (multiplex PCR). In conclusion, the proposed screening technique is an easy-to-apply and
inexpensive test for the detection of AmpC-producing isolates in the routine screening of multidrugresistant
microorganisms
Systematic design of two level pipelined systolic arrays with data contraflow
Many systolic algorithms and related design methodologies
have been recently proposed. Frecuently, in these systolic
algorithms practical considerations are not taken into account.
Equitatively distributed load between processing elements,
pipelined functional units etc, are desirable features when
implementing systolic algorithms.In this paper we present a
design methodology in which these features are considered. As
an example, the methodology is applied to obtain a
problem-size-independent, two-level pipelined 1D systolic
algorithm with data contraflow to efficiently solve triangular
systems of equations.Peer ReviewedPostprint (published version
A multi-physics ensemble of present-day climate regional simulations over the Iberian Peninsula
©. This manuscript version is made available under the CC-BY-NC 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This document is the, Accepted, version of a Published Work that appeared in final form in Climate Dynamics. To access the final edited and published work see: https://doi.org/10.1007/s00382-012-1539-1This work assesses the influence of the model physics in present-day regional climate simulations. It is based on a multi-phyiscs ensemble of 30-year long MM5 hindcasted simulations performed over a complex and climatically heterogeneous domain as the Iberian Peninsula. The ensemble consists of eight members that results from combining different parametrization schemes for modeling the Planetary Boundary Layer, the cumulus and the microphysics processes. The analysis is made at the seasonal time scale and focuses on mean values and interannual variability of temperature and precipitation. The objectives are (1) to evaluate and characterize differences among the simulations attributable to changes in the physical options of the regional model, and (2) to identify the most suitable parametrization schemes and understand the underlying mechanisms causing that some schemes perform better than others. The results confirm the paramount importance of the model physics, showing that the spread among the various simulations is of comparable magnitude to the spread obtained in similar multi-model ensembles. This suggests that most of the spread obtained in multi-model ensembles could be attributable to the different physical configurations employed in the various models. Second, we obtain that no single ensemble member outperforms the others in every situation. Nevertheless, some particular schemes display a better performance. On the one hand, the non-local MRF PBL scheme reduces the cold bias of the simulations throughout the year compared to the local Eta model. The reason is that the former simulates deeper mixing layers. On the other hand, the Grell parametrization scheme for cumulus produces smaller amount of precipitation in the summer season compared to the more complex Kain-Fritsch scheme by reducing the overestimation in the simulated frequency of the convective precipitation events. Consequently, the interannual variability of precipitation (temperature) diminishes (increases), which implies a better agreement with the observations in both cases. Although these features improve in general the accuracy of the simulations, controversial nuances are also highlighted
Modelling genetic evaluation for dressage in Pura Raza Español horses with focus on the rider effect
The most popular use of the Pura Raza Espanol horse in sport is for dres- ~
sage competitions. Tests on young sport horses were first established in
2004 in Spain to collect data for the genetic evaluation of this breed’s suitability
for dressage. The aim of this study was to compare eight different
models to find out the most appropriate way to include the rider in the
genetic evaluation of dressage. A progressive removal of systematic effects
from model was also analysed. A total of 8867 performance records collected
between 2004 and 2011 from 1234 horses aged between 4 and
6 years old were used. The final score in the dressage test was used as the
performance trait. The pedigree matrix contained 8487 individuals.
A BLUP animal model was applied using a Bayesian approach with TM
software. The horse’s age, gender, travelling time, training level, stud of
birth and event were included as systematic effects in all the models.
Apart from the animal and residual effects that were present in all models,
different models were compared combining random effects such as the
rider, match (i.e. rider–horse interaction) and permanent environmental
effects. A cross-validation approach was used to evaluate the models’ prediction
ability. The best model included the permanent environmental,
rider and match random effects. As far as systematic effects are concerned,
the event or the stud of birth was essential effects needed to fit the data
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